EP 4246971 A4 20240417 - QUANTIZATION PARAMETER DECODING METHOD AND DEVICE
Title (en)
QUANTIZATION PARAMETER DECODING METHOD AND DEVICE
Title (de)
QUANTISIERUNGSPARAMETER-DECODIERUNGSVERFAHREN UND -VORRICHTUNG
Title (fr)
PROCÉDÉ ET DISPOSITIF DE DÉCODAGE DE PARAMÈTRE DE QUANTIFICATION
Publication
Application
Priority
- CN 202011396367 A 20201203
- CN 2021135076 W 20211202
Abstract (en)
[origin: WO2022117036A1] Embodiments of the present invention relate to the technical field of video or image compression, and provide a quantization parameter (QP) decoding method and device. The method comprises: determining the current rectangular area to which the current CU belongs, the current rectangular area being one of a plurality of rectangular areas comprised by a CTU to be decoded, and the plurality of rectangular areas all satisfying a preset condition; determining a target context model according to the number of luminance QP difference values decoded in the current rectangular area; decoding a code stream according to the target context model to obtain a target binary symbol, the target binary symbol being used for indicating whether the luminance QP difference value of the current CU is 0, and the target binary symbol being one of the binary symbols of the luminance QP difference value of the current CU; determining the luminance QP difference value of the current CU according to the target binary symbol; and obtaining a luminance QP of the current CU according to the luminance QP difference value of the current CU and a luminance QP prediction value of the current CU. According to the embodiments of the present invention, the bit overhead of the luminance QP difference value in the code stream can be effectively saved, and the coding efficiency can be improved.
IPC 8 full level
H04N 19/124 (2014.01); H04N 19/13 (2014.01); H04N 19/91 (2014.01)
CPC (source: CN EP)
H04N 19/124 (2014.11 - CN EP); H04N 19/13 (2014.11 - CN EP); H04N 19/176 (2014.11 - EP); H04N 19/186 (2014.11 - EP); H04N 19/44 (2014.11 - CN EP); H04N 19/91 (2014.11 - CN EP); H04N 19/94 (2014.11 - CN EP); H04N 19/96 (2014.11 - EP)
Citation (search report)
- [I] WO 2017203930 A1 20171130 - SHARP KK [JP]
- [A] US 2012114034 A1 20120510 - HUANG YU-WEN [TW], et al
- [I] CHEN J ET AL: "Algorithm description for Versatile Video Coding and Test Model 10 (VTM 10)", no. JVET-S2002, 10 October 2020 (2020-10-10), XP030302176, Retrieved from the Internet <URL:https://jvet-experts.org/doc_end_user/documents/19_Teleconference/wg11/JVET-S2002-v2.zip JVET-S2002-v2.docx> [retrieved on 20201010]
- [I] BROSS B ET AL: "Versatile Video Coding (Draft 10)", no. JVET-S2001, 4 September 2020 (2020-09-04), XP030289618, Retrieved from the Internet <URL:http://phenix.int-evry.fr/jvet/doc_end_user/documents/19_Teleconference/wg11/JVET-S2001-v17.zip JVET-S2001-vH.docx> [retrieved on 20200904]
- [I] DENG (BYTEDANCE) Z ET AL: "AHG9: Some cleanups on QP delta signalling", no. m53030 ; JVET-R0073, 2 April 2020 (2020-04-02), XP030285806, Retrieved from the Internet <URL:http://phenix.int-evry.fr/mpeg/doc_end_user/documents/130_Alpbach/wg11/m53030-JVET-R0073-v1-JVET-R0073-v1.zip JVET-R0073-v1.docx> [retrieved on 20200402]
- [AP] SCHWARZ HEIKO ET AL: "Quantization and Entropy Coding in the Versatile Video Coding (VVC) Standard", IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, IEEE, USA, vol. 31, no. 10, 9 April 2021 (2021-04-09), pages 3891 - 3906, XP011880907, ISSN: 1051-8215, [retrieved on 20210930], DOI: 10.1109/TCSVT.2021.3072202
- See also references of WO 2022117036A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 4246971 A1 20230920; EP 4246971 A4 20240417; CN 114598873 A 20220607; CN 114598873 B 20230620; WO 2022117036 A1 20220609
DOCDB simple family (application)
EP 21900062 A 20211202; CN 202011396367 A 20201203; CN 2021135076 W 20211202